What Is Reasonable Suspicion for a DUI Stop?

An officer with reasonable suspicion that a crime has occurred can stop and briefly detain a person for a limited investigation. So, this rule applies when the officer suspects a motorist of driving under the influence (DUI).

In that case, the officer can pull you over if they think you might be intoxicated. They will be looking for whether they have more evidence to support their suspicion. They will usually conduct a field sobriety test or a blood alcohol content (BAC) test, also known as a Breathalyzer. This evidence could give them probable cause to arrest you.

This article discusses what reasonable suspicion for a DUI stop requires. It also addresses the differences between reasonable suspicion and probable cause. In most states, DUI or sobriety checkpoints remain a controversial exception to the rule.

DUI/DWI cases have serious consequences with a conviction. Get a DUI defense lawyer to assess your options as soon after the arrest as possible. In some cases, challenging the underlying reason for the traffic stop can get the charges dismissed or dropped. 

Reasonable Suspicion in Criminal Law

The reasonable suspicion requirement for DUI stops stems from the Fourth Amendment of the U.S. Constitution. It outlines your rights against unreasonable search and seizures by law enforcement. This legal requirement applies when a police officer considers pulling over someone on the road. 

Yet, the definition of “reasonable” can be vague. It depends on the specific context of the case. While there are many common reasons for DUI stops, reasonable suspicion can involve a wide range of factors. 

Examples of Reasonable Suspicion for a DUI Stop

Reasonable suspicion that a motorist is impaired can be established by any of the following observations:

• Straddling the center line
• An illegal turn or other traffic violation such as running a red light
• Drifting or swerving from one lane to another
• Nearly hitting other cars or objects on the roadside
• Extremely slow or erratic driving
• Frequent braking
• Stopping in the middle of the road for no apparent reason

This is by no means a complete list. Anything a law enforcement officer believes is a sign of impaired driving might qualify as reasonable suspicion.

Sometimes, significantly poor driving can be a crime itself. If an officer notices dangerous maneuvers, they may stop and arrest the driver for reckless driving regardless of actual intoxication. But when the officer suspects alcohol is involved, it is often called a “wet reckless” DUI case. 

Suspicion of DUI in Unrelated Stops and Accidents

An officer can investigate further if there’s reasonable suspicion that a driver is impaired after making a stop for something entirely unrelated (a burned-out taillight, for example). The smell of alcohol on a driver’s breath can provide reasonable suspicion to believe a motorist is under the influence of alcohol.

In some cases, reasonable suspicion for a DUI stop may be established even if the officer didn’t witness any actual driving or infraction. For example, an officer can conduct a field sobriety test after a car accident or if a motorist is found unconscious behind the wheel of a parked car. Reasonable suspicion is based on the specific facts of each case.

Reasonable Suspicion vs. Probable Cause

Reasonable suspicion allows an officer to temporarily stop and detain a motorist to investigate further if the officer thinks the motorist may have committed a crime. An officer needs to meet the higher standard of probable cause before making an arrest.

Probable cause means an officer has enough evidence to believe a motorist has probably committed a crime, justifying a DUI arrest. In the context of a DUI stop, an officer likely has probable cause for an arrest if the results of a field sobriety test or breath test point to likely intoxication. The same is true if a blood test shows an illegal blood alcohol content.

Probable cause differs from reasonable suspicion. To meet the probable cause standard, an officer must have enough evidence to suggest that the motorist has most likely committed a crime. Reasonable suspicion, on the other hand, only necessitates that the officer has some indication that the motorist might have committed a crime. It’s a fine distinction but an important one.

Did the Officer Have Reasonable Suspicion for a DUI Stop?

If you aren’t sure whether the police had a good enough reason to pull you over, ask an experienced lawyer. An attorney can gather and review the evidence, such as the police report, officer testimony, or body camera footage. They can offer perspective based on their experience in similar cases and what the law requires of the police. If there are inconsistencies, or the apparent reason for the stop or arrest isn’t legitimate, they can help you take the next steps to protect your rights.

Get Clarity From a DUI Lawyer

You may have questions about the legality of your initial traffic stop or how to handle your criminal charges. Whether this is your first DUI arrest or your third, getting a consultation with a skilled defense attorney is a good idea. It can mean the difference between getting the maximum penalty and potentially having your DUI charges reduced or dropped. 

Seeking legal advice from a defense lawyer can help.  Contact a DUI attorney or law office near you. You can learn about how DUI laws and DUI defenses can affect your case.